Except that the only BCrypt library I can find doesn't implement the HashAlgorithm class so I can't use it with my existing solution. I'd have to rewrite the entire login system... Which I might still do... We'll see 
You could use Rijndael instead
Well, hey, if it's got a GetHashCode() method (which it appears to) I can use it with the code I've got, the only question is how does it compare to BCrypt? I'm obviously not a crypto expert considering I was going to use an SHA variant so what does the crowd think?